Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd23bd5ce6f11c…

MALICIOUS

PDF

58.1 KB Created: 2021-09-01 20:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97dfbe89cb9c1667928d73c5ebbf6768 SHA-1: eda3abcb62ae45d0e42b2344c56d662becc9e9d5 SHA-256: 78bd23bd5ce6f11ceae68a018af601395806522f50c336945cb93532950108ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS uploads points towards a tactic of leveraging potentially untrusted hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9102

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111227b18343---fufopil.pdf In PDF document text
    • https://vinatech.com/userfiles/file/nixip.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/kixifofabedonubewowegiv.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/69705093032.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160802c675fd40---bukuvotav.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/wixusuziwifukavan.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9693862b5b---76545854109.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dafajiv.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/jijusotunojin.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5252c060---mivokikulunuduwer.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f1d1427ffa02be6b95d27111a4ecba9d/82554355719.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4321c8fe141c8ecd842cddbf0b74b12f/simomatekomulalokoruk.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/977a5c157ca54d522a0555dbb55987e4/rivisesatupatemigotu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9flsvuv8pegpndac3v2fpgqgti/gegolesajivog.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/55485187207.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57748cddb---58735074250.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/96290314553.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cbktdn0dalvfeapnuhgqfpoq61/pudesiwezupul.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/lomek.pdfIn PDF document text
    • http://artospace.com/pics/file/78585309641.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/vadanavawaganobip.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/13667204869.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/edb75bb1c70aa254eb824dbba8304c4b/famatulip.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5ang8jka2valcahm4g3tg20hh3/20966158557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=physical+properties+of+metals+and+nonmetalsPDF link annotation

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